gtknativeengine.java

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            return (sb.getOrientation() == JScrollBar.HORIZONTAL) ?
                widgets[0] : widgets[1];
        }
        
        return null;
    }
    
    public void paintArrow(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, ArrowType direction,
            String detail, int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_arrow(widget, state, shadowType.ordinal(),
                detail, x - x0, y - y0, w, h, direction.ordinal());
    }

    public void paintBox(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType,
            String detail, int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_box(widget, state, shadowType.ordinal(),
                detail, x - x0, y - y0, w, h, context.getComponentState());
    }

    public void paintBoxGap(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType,
            String detail, int x, int y, int w, int h,
            PositionType boxGapType, int tabBegin, int size) {
        
        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_box_gap(widget, state, shadowType.ordinal(), detail,
                x - x0, y - y0, w, h, boxGapType.ordinal(), tabBegin, size);
    }

    public void paintCheck(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h) {

        int synthState = context.getComponentState();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_check(widget, synthState, detail, x - x0, y - y0, w, h);
    }

    public void paintExpander(Graphics g, SynthContext context,
            Region id, int state, ExpanderStyle expanderStyle, String detail,
            int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_expander(widget, state, detail, x - x0, y - y0, w, h,
                              expanderStyle.ordinal());
    }

    public void paintExtension(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h, PositionType placement, int tabIndex) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_extension(widget, state, shadowType.ordinal(), detail,
                               x - x0, y - y0, w, h, placement.ordinal());
    }

    public void paintFlatBox(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h, ColorType colorType) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_flat_box(widget, state, shadowType.ordinal(), detail, 
                              x - x0, y - y0, w, h,
                              context.getComponent().hasFocus());
    }

    public void paintFocus(Graphics g, SynthContext context,
            Region id, int state, String detail, int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_focus(widget, state, detail, x - x0, y - y0, w, h);
    }

    public void paintHandle(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h, Orientation orientation) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_handle(widget, state, shadowType.ordinal(), detail,
                            x - x0, y - y0, w, h, orientation.ordinal());
    }

    public void paintHline(Graphics g, SynthContext context,
            Region id, int state, String detail, int x, int y, int w, int h) {
        
        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_hline(widget, state, detail, x - x0, y - y0, w, h);
    }

    public void paintOption(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h) {

        int synthState = context.getComponentState();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_option(widget, synthState, detail, x - x0, y - y0, w, h);
    }

    public void paintShadow(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_shadow(widget, state, shadowType.ordinal(), detail,
                            x - x0, y - y0, w, h);
    }

    public void paintSlider(Graphics g, SynthContext context,
            Region id, int state, ShadowType shadowType, String detail,
            int x, int y, int w, int h, Orientation orientation) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_slider(widget, state, shadowType.ordinal(), detail,
                            x - x0, y - y0, w, h, orientation.ordinal());
    }

    public void paintVline(Graphics g, SynthContext context,
            Region id, int state, String detail, int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_vline(widget, state, detail, x - x0, y - y0, w, h);
    }

    public void paintBackground(Graphics g, SynthContext context,
            Region id, int state, Color color, int x, int y, int w, int h) {

        state = GTKLookAndFeel.synthStateToGTKStateType(state).ordinal();
        int widget = getWidgetType(context.getComponent(), id).ordinal();
        native_paint_background(widget, state, x - x0, y - y0, w, h);
    }
    
    private final static ColorModel[] COLOR_MODELS = {
        // Transparency.OPAQUE
        new DirectColorModel(24, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000),
        // Transparency.BITMASK
        new DirectColorModel(25, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x01000000),
        // Transparency.TRANSLUCENT
        ColorModel.getRGBdefault(),
    };

    private final static int[][] BAND_OFFSETS = {
        { 0x00ff0000, 0x0000ff00, 0x000000ff },             // OPAQUE
        { 0x00ff0000, 0x0000ff00, 0x000000ff, 0x01000000 }, // BITMASK
        { 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000 }  // TRANSLUCENT
    };

    
    /**
     * Paint a cached image identified by its size and a set of additional
     * arguments, if there's one.
     *
     * @return true if a cached image has been painted, false otherwise
     */
    public boolean paintCachedImage(Graphics g,
            int x, int y, int w, int h, Object... args) {
        if (w <= 0 || h <= 0) {
            return true;
        }
        
        // look for cached image
        Image img = cache.getImage(getClass(), null, w, h, args);
        if (img != null) {
            g.drawImage(img, x, y, null);
            return true;
        }
        return false;
    }

    /*
     * Allocate a native offscreen buffer of the specified size.
     */
    public void startPainting(Graphics g,
            int x, int y, int w, int h, Object... args) {
        nativeStartPainting(w, h);
        x0 = x;
        y0 = y;
        w0 = w;
        h0 = h;
        graphics = g;
        cacheArgs = args;
    }
    
    /**
     * Called to indicate that painting is finished. We create a new
     * BufferedImage from the offscreen buffer, cache it, and paint it.
     */ 
    public void finishPainting() {
        int[] data = new int[w0 * h0];
        int transparency = nativeFinishPainting(data, w0, h0);

        int[] bands = BAND_OFFSETS[transparency - 1];
        DataBuffer dataBuffer = new DataBufferInt(data, data.length);
        WritableRaster raster = Raster.createPackedRaster(
                dataBuffer, w0, h0, w0, bands, null);

        // Raster created this way is not accelerated.
        // We re-enable acceleration here.
        if (raster instanceof SunWritableRaster) {
            ((SunWritableRaster)raster).setStolen(false);
        }
        
        ColorModel cm = COLOR_MODELS[transparency - 1];
        Image img = new BufferedImage(cm, raster, false, null);
        cache.setImage(getClass(), null, w0, h0, cacheArgs, img);
        graphics.drawImage(img, x0, y0, null);
    }
    
    /** 
     * Notify native layer of theme change, and flush cache
     */
    public void themeChanged() {
        synchronized(sun.awt.UNIXToolkit.GTK_LOCK) {
            native_switch_theme();
        }
        cache.flush();
    }
    
    /* GtkSettings enum mirrors that in gtk2_interface.h */
    public Object getSetting(Settings property) {
        synchronized(sun.awt.UNIXToolkit.GTK_LOCK) {
            return native_get_gtk_setting(property.ordinal());
        }
    }
}